前混合水射流超细粉碎煤粒的试验研究

以山西西山煤样为原料，开发了一种适合于煤炭物性的前混合水射流超细煤粉试验装置，研究了加载压力、循环碰撞次数和浓度对超细煤粉大小及分布的影响，并利用激光粒度仪对所得超细煤粉进行了粒度分析，用ξ电位实验研究了超细煤粉颗粒悬浮体系的分散性.试验表明，采用角形喷嘴淹没水射流技术，可以在循环碰撞为3~4次、加载压力为43~50 MPa的工艺条件下将料浆比为25%~35%的煤粒粉碎至d 50<22.6 μm，为采用前混合水射流方法粉碎煤炭制备高性能水煤浆燃料提供了理论基础和关键技术.

Experimental study of micronized coal by premixed water jet

A test facility, suitable for physical characteristics of coal, was designed to experiment on micronized coal by premixed water jet. Xishan coal in Shanxi Province as raw materials, the influence on particle size distribution of micronized coal was studied by adjusting the loading pressure, circulating collision times, and concentration of coal particle. The particle size distribution of micronized coal was measured by using laser size analyzer and the dispersibility of micronized coal suspension system was studied by ξ electric potential experiment. The result indicates that using water jet technology by dihedral nozzle can pulverize coal particle in the 25%~35%ratio coal-water slurry to micronized coal,d50<22.6 μm, which is operated on the conditions of 43~50 MPa loading pressure and 3~4 loading times. This article offers the theoretical basis and key technology for pulverizing coal by premixed water jet to prepare coal-water slurry with high performance.